Complete the code for the recursive method shown below, which is intended to compute the sum of the first n positive integers:
A)return n + s(n - 1);
B)return s(n) + n - 1;
C)return n + (n - 1);
D)return n + s(n + 1);

Question

Complete the code for the recursive method shown below, which is intended to compute the sum of the first n positive integers:  
A)return n + s(n - 1); 
B)return s(n) + n - 1; 
C)return n + (n - 1); 
D)return n + s(n + 1);

Quizplus · Accepted Answer

This recursive method is using the formula for the sum of the first n positive integers, which is n(n+1)/2. The recursive call subtracts 1 from n and adds it to the sum, which is equivalent to adding n to the sum of the first n-1 positive integers. Therefore, choice A is the correct implementation as it correctly calculates the sum of the first n positive integers recursively.

Complete the Code for the Recursive Method Shown Below, Which